Cofiring of wood cocombustion

Markku Orjala, Riikka Ingalsuo, Tapio Patrikainen, Martti Mäkipää, Jouni Hämäläinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)


The objective of this study was to determine safe combustion conditions in circulating and bubbling fluidised-bed boilers for wood chips produced by different forest harvesting chains. The optimal mixing ratios for typical and commonly used forest chip qualities, as well as for mixtures of chips and other fuels, under steam temperatures typical of circulating and bubbling fluidised-bed boilers are also determined. Emissions are also reviewed. The combustion and co-firing properties of fuels produced by different forest chains, and their suitability were studied first in VTT's test facilities and later in industrial-scale power plant boilers. The formation of alkaline and chlorine compounds and their effect on boiler fouling were studied by deposit probes in the test facilities. Deposits and phase changes in their compounds and corrosion risks are analysed by SEM-EDX. Utilisation of logging residue chips can cause deposition on heat exchanger surfaces and corrosion due to chlorine of wood ash. The harmful formation of alkaline and chlorine compounds on boiler surfaces could be prevented by co-firing sulphur-containing fuel.
Original languageEnglish
Title of host publicationNordic Treasure Hunt
Subtitle of host publicationExtracting Energy from Forest Residues
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
ISBN (Electronic)951-38-5709-3
ISBN (Print)951-38-5708-5
Publication statusPublished - 2000
MoE publication typeA4 Article in a conference publication
EventNordic Treasure Hunt: Extracting Energy from Forest Residue: International Wood Energy Workshop - Jyväskylä, Finland
Duration: 30 Aug 200030 Aug 2000

Publication series

SeriesVTT Symposium


WorkshopNordic Treasure Hunt: Extracting Energy from Forest Residue

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